Spatial and temporal patterns in reef sediment accumulation ... - BioOne
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Spatial and temporal patterns in reef sediment accumulation ... - BioOne
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Spatial and temporal patterns in reef sediment accumulation and composition, southwestern insular shelf of Puerto Rico R. Herna´ndez, C. Sherman, E. Weil, and P. Yoshioka University of Puerto Rico – Mayagüez, Deptartment of Marine Sciences, PO Box 9013, Mayagüez, Puerto Rico ABSTRACT.—Effects of terrigenous sedimentation are considered a serious threat to Puerto Rico’s coral reefs. This study assesses: 1) the composition of sediments accumulating at reef sites on the southwestern shelf of Puerto Rico; 2) the spatial extent to which terrigenous materials are reaching these reefs; and 3) the spatial and temporal variability of sediment composition, grain size and trap collection rates. Sediment traps were deployed at 9 sites from inner shelf to shelf edge. Analyses of total sediment weight (April 2006 - April 2007) show a similar temporal pattern at all sites with June and August having the highest accumulation rates. In general, there is a decrease in trap accumulation rate with depth. Carbon composition analyses indicate that samples consist primarily of calcium carbonate with lesser amounts of terrigenous and organic material, and a slightly higher percentage of terrigenous material in the 63 μm) and mud (
